My definition is a little bit simpler. The Myers-Briggs Type Indicator is a simple tool you can use to better understand what motivates the way you and your peers think and act. It isn’t a tell-all book about you, as we are all different, but it does a pretty good job of honing in on your personality type. It can also help you understand the fundamental way in which the people around you (friends, family, co-workers) think.